What is main purpose of shuffle tracking?
To get high cards at the beginning or the end of shoe?if beginning,then there are some risk(I dont know indexes)
The objective is to bet big into slugs of tens and aces, and cut low cards out of play, not merely to get a positive count slug at the start of the shoe. It is just a logical extension of card counting.
As to indexes, you use the same strike numbers you use for a regular count system.
the shuffles are simple such as first deck merged completely with 4th, you know the count of the slug. I once played against a dealer who shuffled undealt cards seperate from the dealt thus I know exactly the count of the slug I tracked. The result was $52k a night...: )